preamp for a JE LABS 2A3DX amp

lquintas · 17th January 2009, 10:49 PM

After building my JE LABS Stereo SE2A3dx amp (see http://members.myactv.net/~je2a3/se300b.htm)
I am toying with the idea of building a preamp in order to improve the sound (if it is possible, I’m very happy with). I have seen a lot of schematics (too many) and I need advice to know which will match better with my amp. My source is an ARCAM CD73 CD player.
Possible preamps:

Salas’ 6V6 preamp

Hendram’s E182CC preamp (seems easy)

SY’s ECC88 Heretical preamp

TNT Preamble N 7586 preamp

Triode Dick Cleo 6 6N30P preamp

Libero’s 6H30 preamp

Pete Millet Low-mu preamp

Moebius 6AQ5 preamp

Andy Evans 10Y preamp

Poindexter 6T4 preamp

12b4A preamp (there are a lot)
Gavin
ArnoldC
Eliduttman
JDev
Guldbrandsen

Please, your advice

korneluk · 18th January 2009, 12:04 AM

Hola lquintas,

From my experience driving amps with 6SN7 inputs, you should look at a DHT-based preamp - i.e. 26, 10Y, etc.

If you want to avoid the hassle of dealing with hum and microphonics, the go straight to the 27 tube. Here's a simple one:

27 IDHT Parafeed Preamplifier
http://nullspace.us/27.html

I've personally used an Emotive Audio Erato with a 6SN7/45 Jeff Korneff amp and found the combination stunning.

Saludos y buena fortuna en el 2009,

--josé k.

lquintas · 18th January 2009, 02:03 PM

Thank you Korneluk, I didn't know the preamp you propose.
Best wishes for you too.

Eli Duttman · 18th January 2009, 04:55 PM

Quote:

I am toying with the idea of building a preamp in order to improve the sound (if it is possible, I’m very happy with). I have seen a lot of schematics (too many) and I need advice to know which will match better with my amp. My source is an ARCAM CD73 CD player.

Senor,

The JE Labs schematic you linked shows a 3 stage integrated stereoblock amp. I suggest that you look at something other than a preamp to improve overall system performance.

What sort of volume attenuators are you using?

ARCAM CDPs have solid reputations, but you may be able to improve things in the analog buffer amp area. The DECWARE DIY ZKIT4 has the sort of small footprint needed for inside OEM enclosure CDP modifications.

lquintas · 18th January 2009, 06:59 PM

Thank you Eli. If my system doesn't need a preamp, perhaps I'll try a phono preamp, but I'll have to get a new turntable.
The volumen pot I have is a dual Alps Blue Velvet. Would an step attenuator worth it?

17th January 2009, 10:49 PM	#1
lquintas diyAudio Member Join Date: Sep 2006	preamp for a JE LABS 2A3DX amp After building my JE LABS Stereo SE2A3dx amp (see http://members.myactv.net/~je2a3/se300b.htm) I am toying with the idea of building a preamp in order to improve the sound (if it is possible, I’m very happy with). I have seen a lot of schematics (too many) and I need advice to know which will match better with my amp. My source is an ARCAM CD73 CD player. Possible preamps: Salas’ 6V6 preamp Hendram’s E182CC preamp (seems easy) SY’s ECC88 Heretical preamp TNT Preamble N 7586 preamp Triode Dick Cleo 6 6N30P preamp Libero’s 6H30 preamp Pete Millet Low-mu preamp Moebius 6AQ5 preamp Andy Evans 10Y preamp Poindexter 6T4 preamp 12b4A preamp (there are a lot) Gavin ArnoldC Eliduttman JDev Guldbrandsen Please, your advice

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18th January 2009, 12:04 AM	#2
korneluk diyAudio Member Join Date: Jan 2005 Location: South Florida	Hola lquintas, From my experience driving amps with 6SN7 inputs, you should look at a DHT-based preamp - i.e. 26, 10Y, etc. If you want to avoid the hassle of dealing with hum and microphonics, the go straight to the 27 tube. Here's a simple one: 27 IDHT Parafeed Preamplifier http://nullspace.us/27.html I've personally used an Emotive Audio Erato with a 6SN7/45 Jeff Korneff amp and found the combination stunning. Saludos y buena fortuna en el 2009, --josé k.

18th January 2009, 02:03 PM	#3
lquintas diyAudio Member Join Date: Sep 2006	Thank you Korneluk, I didn't know the preamp you propose. Best wishes for you too.

18th January 2009, 06:59 PM	#5
lquintas diyAudio Member Join Date: Sep 2006	Thank you Eli. If my system doesn't need a preamp, perhaps I'll try a phono preamp, but I'll have to get a new turntable. The volumen pot I have is a dual Alps Blue Velvet. Would an step attenuator worth it?

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